HYDROS Control 4 Aquarium Controller
HY-CTRL4
The HYDROS Control 4 is an affordable, easy-to-use aquarium controller that monitors temperature, pH, ORP, and water level while controlling pumps, timers, fans, and solenoids. It features an IP-65 rated...
Or build it into a bundle — save up to 6% ↓What it is, and who it is for.
The HYDROS Control 4 is an affordable, easy-to-use aquarium controller that monitors temperature, pH, ORP, and water level while controlling pumps, timers, fans, and solenoids. It features an IP-65 rated splash-proof enclosure, operates on the HYDROS Safety Net failsafe network, and can be managed locally over WiFi (no internet required) or remotely via the HYDROS Cloud. All HYDROS products are engineered, assembled, and supported in the USA.
Build around the HYDROS Control 4 Aquarium Controller.
It's already in your system below. Add the flow, filtration and dosing around it and the discount starts working — tiers climb as the build grows, and the reef meter fills with it.
Pick the right one, not the biggest one
The honest line-up from controllers & automation. Most buyers reading this page should buy the middle column.
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HYDROS Control 4 Aquarium Controller
HYDROS Control X4 Aquarium ControllerAsked before checkout
The questions our support inbox actually gets.
Does it ship quickly?+
Orders placed before 2 PM ET on a business day leave the same day. Tracking is emailed the moment the label prints.
What if it's the wrong fit for my tank?+
Return it. 30 days, no restocking fee, refund to the original payment method. Better: tell us your tank first and we'll spec the system for free — half of all returns are sizing problems.
Who handles the warranty?+
We do. Everything carries the manufacturer's warranty and we run the claim for you — one email to us instead of a ticket queue.
How does the bundle discount work?+
Add items in the bundle builder: 2+ items saves 5%, 3+ saves 8%, 4+ saves 12%, and 5+ saves 15% off the whole system, applied at checkout.